Geometric ferroelectricity in rare-earth compounds R GaO3 and R InO3

Tetsuya Tohei, Hiroki Moriwake, Hidenobu Murata, Akihide Kuwabara, Ryo Hashimoto, Tomoyuki Yamamoto, Isao Tanaka

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

We have studied the stability and ferroelectric properties of hexagonal R GaO3 and R InO3 (R: rare-earth elements) by first-principles calculations. Computed spontaneous polarization in the series shows a systematic increase with the rare-earth elements, with values being larger in R InO3 than in the corresponding R GaO3. The largest polarization found is about 10μC/ cm2 for ErInO3, which is about twice as large as those observed in hexagonal R MnO3. The polarization can be further increased by applying in-plane compressive stress. The Born effective charges of constituent ions in the compounds are found to be similar to their formal values, implying that the ferroelectric displacements are merely driven by the ionic size effect. A transition to the high-symmetry phase at around 1500 K was confirmed in GdInO3 and DyInO3 by in situ high-temperature powder x-ray diffractometry. The present systems should belong to the family of geometric ferroelectrics.

Original languageEnglish
Article number144125
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number14
DOIs
Publication statusPublished - 2009 Apr 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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